docs(plan): revise Phase 11 — ordinal, full stack retirement, shared cards, release-share, queue

Fold Daniel's 2026-06-15 decisions into PLAN.md §11 and the product note:
4→7 commitments, six waves. Headline: the track ordinal already shipped
in Phase 8, so commitment 5 is verify-and-consume, not a new migration.
Queue half of §1.3 absorbed; preload stays deferred.

PLAN.md

@@ -25,11 +25,19 @@ These were flagged during the audit but classified as feature work, not defect f
 
 ### 1.3 Preload / prefetch of the next track
 
-- **What:** No mechanism to begin the next track's stream during the tail of the current. Each play is a cold fetch.
+> **Split as of 2026-06-15.** This item bundled two things: (a) a **queue model** ("a notion of next
+> track") and (b) **preload/prefetch** (begin the next track's bytes during the current tail). The
+> **queue half (a) is now absorbed into Phase 11** (commitment 7 — Daniel: "now is the natural time
+> for that"; full spec in `product-notes/phase-11-public-site-enhancements.md §3c`). The **preload
+> half (b) remains deferred here** and still gates crossfade (1.4) and gapless (1.5). The open
+> question below — queue in `IPlayerService` vs. a separate orchestrator — is **answered in the
+> Phase 11 spec** (strong steer: a separate `IQueueService` above the single-slot player; final call
+> staff-engineer's at implementation). When Phase 11's queue lands, the preload below becomes "add a
+> subscriber to the queue's already-known next track," not a fresh queue design.
+
+- **What (deferred — preload only):** No mechanism to begin the next track's stream during the tail of the current. Each play is a cold fetch.
 - **Why it matters:** Prerequisite for both crossfade (1.4) and gapless (1.5). Also a perceived-latency win on its own — track-change feels instant when the bytes are already in flight.
-- **Shape:** A second `HttpClient` request kicked off when the current track passes a configurable threshold (e.g. last 10 seconds). Bytes accumulate into a staged `StreamDecoder` instance rather than the live one. Promotion to "current" happens at end-of-stream or on user-selected next.
-- **Prerequisite:** Requires a notion of "next track" — today the player only knows the current one. That implies either a playlist/queue model in `IPlayerService` or a passive "what was the next row in the gallery" inference.
-- **Open question:** Does a queue model belong in `IPlayerService`, or is the player a single-slot device that a future `PlaylistService` orchestrates above? Worth a design note before implementation. Capture in product notes when picked up.
+- **Shape:** A second `HttpClient` request kicked off when the current track passes a configurable threshold (e.g. last 10 seconds). Bytes accumulate into a staged `StreamDecoder` instance rather than the live one. Promotion to "current" happens at end-of-stream or on user-selected next. **The "next track" it prefetches comes from Phase 11's `IQueueService`** — that dependency is now satisfied by the queue work, not an open question.
 
 ### 1.4 Crossfade
 
@@ -194,24 +202,28 @@ Full design, renderer architecture, the four effects, acceptance criteria, and p
 
 ## Phase 11 — Public Site Enhancements
 
-The next pass over the public listening surface, after Phase 9 + Wave 8 moved the site to release-cardinal browse (`/archive`) and per-medium detail. The spine of the phase: **make the release the cardinal unit of every public navigation, and make every navigation an addressable, shareable URL.** Four Daniel commitments — two structural (a Cuts detail page; the release-title click resolves medium → dedicated detail page), two normalization/polish (retire the redundant `/tracks?album` view; encode Archive filters in the URL). Full design, framing corrections, wave decomposition, and the gap analysis: `product-notes/phase-11-public-site-enhancements.md`.
+The next pass over the public listening surface, after Phase 9 + Wave 8 moved the site to release-cardinal browse (`/archive`) and per-medium detail. The spine of the phase: **make the release the cardinal unit of the public site, make every navigation an addressable shareable URL, and make the album a first-class playable object** (ordered, queue-able, shareable). **Seven Daniel commitments** (the original four plus three added 2026-06-15 when he resolved the open questions and expanded scope): (1) a Cuts detail page `/cuts/{id}`; (2) the player-bar release-title resolves medium → dedicated detail page; (3) retire the **whole** track-cardinal stack **and** normalize release-card rendering into shared components; (4) encode Archive filters in the URL; (5) explicit track ordinal editable from the CMS; (6) release-level Share; (7) a play-queue system (absorbs the queue half of §1.3). Full design, framing corrections, wave decomposition, gap analysis: `product-notes/phase-11-public-site-enhancements.md`.
 
-**State it inherits (verified 2026-06-15).** `/sessions/{id}` and `/mixes/{id}` detail pages **exist and are mature** (both inherit `ReleaseDetailBase`'s prerender bridge; `MixDetail` composes `ReleaseDetailScaffold`, `SessionDetail` deliberately diverges). `/archive` is **already** a release-cardinal searchable browser (search + medium + genre). The two real gaps: **Cuts have no single-release detail page** (`/cuts` cards open `/tracks?album={title}` — the track gallery filtered), and **`/archive` holds its filters in component fields, not the URL**.
+**State it inherits (verified 2026-06-15).** `/sessions/{id}` and `/mixes/{id}` detail pages **exist and are mature** (both inherit `ReleaseDetailBase`'s prerender bridge; `MixDetail` composes `ReleaseDetailScaffold`, `SessionDetail` deliberately diverges). `/archive` is **already** a release-cardinal searchable browser (search + medium + genre). `ReleaseGallery` is the shared release-card grid — but **only Sessions/Mixes use it**; Archive and Cuts re-implement equivalent card markup inline. The real gaps: **Cuts have no single-release detail page** (`/cuts` cards open `/tracks?album={title}`), and **`/archive` holds its filters in component fields, not the URL**. The queue/playlist **does not exist** (single-slot player).
 
-**Three framing corrections (brief vocabulary vs. live routes).** (1) There is **no `/tracks/{id}` route** — the track-cardinal detail is `/track/{EntryKey}`, and the player-bar title links there. The brief's "`/tracks/{id}` becomes a router" is best realized as a **medium→route resolver** applied at click sites (the player bar already carries the release id + medium, so no round-trip is needed), plus a thin `/tracks/{id}` redirect page for bare-release-id deep links. (2) The new `/cuts/{id}` album page is the phase's center of gravity — the first **multi-track** release detail. (3) Requirement 4 is a **URL-binding pass over the existing `ArchiveView`**, borrowing the `TracksView` `[SupplyParameterFromQuery]` pattern verbatim — not a new browser.
+**Headline correction — commitment 5 is already built.** The brief framed the track ordinal as a new column + EF migration + a Daniel-gated apply step. **The read shows it already shipped in Phase 8:** `TrackEntity.TrackNumber` (1-based, non-null), migration `20260611005700` **already applied**, `TrackDto` mirror, API write path (validated `> 0`), CMS reorder (`BatchEdit` assigns ordinal from list position on submit), and the read already `.OrderBy(t => t.TrackNumber)`. **No new schema, no migration to gate.** Commitment 5 collapses to *verify-and-consume*: confirm the public read projects/sorts `TrackNumber` and that `CutDetailViewModel` orders by it (a one-line fix if not). See spec §3a.
 
-**Design discipline.** The medium→route resolver is **one table** (promote `ArchiveView.DetailHref` to a shared `ReleaseRoutes` helper) consumed by the player bar, Archive cards, and Cuts cards — not three switches (memory *One source, multiple views*). The `/cuts/{id}` page composes `ReleaseDetailScaffold` via a generalized `Header` slot + new `BodyContent` slot for the track list — **not** a boolean layout flag (Phase 9 §5.3's named rule: layout variance rides a slot, never a flag). The Archive URL-binding makes the URL the source of truth (history-driven re-fetch in `OnParametersSet`), so back/forward + shareable links fall out structurally.
+**Framing corrections (brief vocabulary vs. live routes).** (1) There is **no `/tracks/{id}` route** — the track-cardinal detail is `/track/{EntryKey}`. The brief's "`/tracks/{id}` becomes a router" is best realized as a **medium→route resolver** at click sites (the player bar already carries release id + medium — no round-trip), plus a thin `/tracks/{id}` redirect page for deep links. (2) The new `/cuts/{id}` album page is the phase's center of gravity — the first **multi-track** release detail. (3) Requirement 4 is a **URL-binding pass over the existing `ArchiveView`**, borrowing the `TracksView` `[SupplyParameterFromQuery]` pattern — not a new browser.
 
-Sequenced as four tracks across two parallel waves.
+**Design discipline.** The medium→route resolver is **one table** (`ReleaseRoutes.DetailHref`) consumed by the player bar, Archive, and Cuts cards. The shared `ReleaseGallery` becomes the **one** release-card grid across all four browse surfaces (Archive/Cuts fold in via a new per-card `HrefResolver`), not three inline copies (memory *One source, multiple views*). The `/cuts/{id}` page composes `ReleaseDetailScaffold` via a generalized `Header` slot + a `BodyContent` slot for the track list — **not** a boolean layout flag (Phase 9 §5.3). The queue is a separate `IQueueService` orchestrating above the single-slot player (strong steer; final call staff-engineer's). Header Play binds to a single handler that swaps single-track → `QueueService.PlayRelease` with no page change (memory *Design for adaptability up front*).
 
-- **11.A — `/cuts/{id}` album-detail page.** Left header (name, artist, genre, year, Play + Share), right cover with theme border, ordered track list with per-row play, header Play → track 1. New `CutDetailViewModel`; reuses `GetById` + the existing `releaseId`-filtered track page (both exist). **Load-bearing prerequisite for 11.B's Cut resolution.**
-- **11.B — medium→route resolver + repoint.** Shared `ReleaseRoutes.DetailHref`; Cut resolves to `/cuts/{id}` (needs 11.A); repoint player-bar title, Archive cards, `AlbumsView` cards; thin `/tracks/{id}` redirect page. **Depends on 11.A.**
-- **11.C — normalization / reduction.** Retire the `/tracks?album` filter branch (safe once 11.B repoints both consumers). Decide with Daniel whether to retire the whole track-cardinal stack (`TracksView`/`TrackDetail`/`TrackCard`/`TracksGallery`) now that Cuts have a proper detail page and `/tracks` is already nav-demoted — the phase's biggest reduction lever. Consolidate duplicate medium-label lookups. **Depends on 11.B.**
-- **11.D — Archive filters in the URL.** `/archive?q=&medium=&genre=`. Fully independent — touches only `ArchiveView`. **No dependency; free-floating.**
+Sequenced as **six waves**; the critical path is `11.A → 11.B → 11.C`, with 11.D / 11.E / 11.F hanging off it.
 
-**Dependency shape:** `11.A → 11.B → 11.C`; **11.D parallel**.
+- **11.A — `/cuts/{id}` album-detail page.** Left header (name, artist, genre, year, Play + Share), right cover with theme border, ordered track list (by `TrackNumber`) with per-row play, header Play. New `CutDetailViewModel`; reuses `GetById` + the `releaseId`-filtered track page (both exist). Ordinal is a **verification** (§3a), not a dependency. Header/row Play consume 11.F when present, else degrade to single-track (§3.4 seam). **Load-bearing prerequisite for 11.B's Cut resolution.**
+- **11.B — `ReleaseRoutes` resolver + repoint.** Promote `ArchiveView.DetailHref` to a shared `ReleaseRoutes.DetailHref`; Cut resolves to `/cuts/{id}` (needs 11.A); repoint player-bar title (→ release), Archive cards, `AlbumsView` cards; thin `/tracks/{id}` redirect page. **Depends on 11.A.**
+- **11.C — retire + normalize (the heart).** With §2 removing every inbound link: **delete the whole track-cardinal stack** (`TracksView`/`TrackDetail`/`TrackCard`/`TracksGallery`/`GalleryViewMode` + `/tracks`, `/track/{EntryKey}` routes) **and** fold Archive + Cuts inline cards into the shared `ReleaseGallery` (new `HrefResolver`); consolidate the medium-label lookup. **Depends on 11.B.** (Cut track-row is a separate small `TrackRow`, not `ReleaseGallery`.)
+- **11.D — Archive filters in the URL.** `/archive?q=&medium=&genre=`, history-driven (§5). Touches only `ArchiveView`. **Free-floating — but coordinate with 11.C** (both edit `ArchiveView`).
+- **11.E — release-level Share.** `SharePopover` gains a release mode that copies `ReleaseRoutes.DetailHref(release)`; wire the Cut header Share to it. **Depends on 11.B** (resolver) + a release detail to share.
+- **11.F — queue model.** `IQueueService` above the single-slot player + one new player `TrackEnded` hook + player-bar skip controls. **Free-floating, can start cold day one.** Gates the Cuts "play album" affordance (11.A header Play). **Preload (§1.3 half b) stays OUT** — design the seam, defer the feature.
 
-**Open questions (Daniel — in the spec §7):** player-bar title now points at release detail not track detail (recommend yes — it is the premise of req 1); `/cuts/{id}` scaffold strategy (generalized `Header` slot vs. bespoke page); Cut header affordance idiom (icon vs. labeled buttons); **track ordering** — `TrackEntity` has no `TrackNumber` column, so album order is insertion/`Id` order today (recommend ship on insertion order, raise `TrackNumber` as its own small phase only if needed — `[do not assume into Phase 11]`); `/tracks` retirement scope (album-branch only vs. whole track-cardinal stack). **Adjacent gaps surfaced, not in scope:** the Cuts album page is the strongest case yet for the deferred **play queue** (`§1.3`) — "play album" is the expected affordance; design header Play so a future enqueue-album is a handler swap, not a rewrite. `SharePopover` is track-keyed — a Cut header Share arguably shares the **release** URL, a new share target.
+**Dependency shape:** `11.A → 11.B → 11.C`; `11.B → 11.E`; **11.D and 11.F parallel** (11.D coordinates with 11.C on `ArchiveView`; 11.F's "play album" is consumed by 11.A). The two cold-start items are **11.A** and **11.F** — kick both off first so "play album" works on first ship of the Cut page.
+
+**Resolved by Daniel (2026-06-15), kept visible per file convention:** player-bar title → release detail (was OQ1); track ordinal in scope **and already built** (was OQ4, reversed then found done); retire the **whole** track-cardinal stack (was OQ5, full cut chosen); release-level Share in scope; play-queue in scope (queue half of §1.3 absorbed; preload half stays deferred). **Still open (spec §7.2):** `/cuts/{id}` scaffold strategy (generalized `Header` slot — recommended — vs. bespoke); Cut header affordance idiom (icon vs. labeled buttons); queue architecture (separate `IQueueService` — strong steer; staff-engineer's final call); whether release-share keeps "Embed player" (recommend copy-link-only); `/genres` fate (out of scope, flag as adjacent).
 
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